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acid activity algae America amount animals annual aquatic atmosphere bacteria basin become beneath body bottom carbon changes compared concentration contains curve deep density deposits depth described dissolved ecosystem effects energy eutrophic example factor Figure fish flow freshwater greater green habitats heat important increase ions known lake larvae later layer least less light lower marine mass material mean meter method Michigan move natural North nutrients occur organic origin oxygen particles perhaps period photosynthesis plankton plants Pleistocene ponds present primary production ratio reaches reduced regions relation relatively represented result river saline sample sediments serve shallow solution species spring stream studies summer surface Table temperature termed Textbook of Limnology tion typical unit upper usually various vertical volume waves wind winter zone